• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

To investigate how the concentration of sodium thiosulphate as it is diluted with water and then added to hydrochloric acid, affects the rate of reaction.

Extracts from this document...


Sodium thiosulphate investigation Aim: To investigate how the concentration of sodium thiosulphate as it is diluted with water and then added to hydrochloric acid, affects the rate of reaction. Prediction: I think that as I dilute the sodium thiosulphate with water and then add it to the hydrochloric acid, the time for the rate of reaction will increase. I have followed a special theory for this. The theory is the collision theory, which states, as you increase a substance there are more particles in it resulting in more collisions. This theory can also work vice versa because in this experiment we will be decreasing the concentration of sodium thiosulphate resulting in less collisions, therefore extending the time for the reaction to take place. In a low concentration, the particles will be few and widely spread. This means that the number of reactions will be limited because fewer particles will meet. At higher concentrations there are more particles and so they probability of them coming into contact with other particles is increased. But in this experiment we are swiftly decreasing the concentration of sodium thiosulphate. This theory is applied when the reaction is applied. ...read more.


I also made sure someone always stayed on top of the beaker to observe when the cross-disappeared. I always made sure that I never moved the beaker a lot because I didn't want any more collisions resulting in a faster rate of reaction. I always repeated my exercise 3 times, so I could get a more accurate mean average. I used the Internet a lot to research on rate of reaction, so I could extend my knowledge on this subject, giving better observations. Quantities used: Experiment no. Volume of sodium thiosulphate CM3 Volume of water used CM3 Volume of HCL used CM3 Total volume CM3 1. 35 00 05 40 2. 30 05 05 40 3. 25 10 05 40 4. 20 15 05 40 5. 15 20 05 40 6. 10 25 05 40 7. 05 30 05 40 Results: (on graph paper) Conclusions: From my graph I can see that most of my results were correct, although I did have an anomalous result. My results agree with my prediction because I predicted that the lower the concentration of sodium thiosulphate, and the higher the amount of water, the longer the reaction would take to occur. ...read more.


These were probably due to me rushing the measuring of each solution. We were set a certain time limit of one 50-minute lesson, to get each solution done at least twice so I might have rushed. Other reasons for these anomalous results could be that the eye could also have made mistakes in judging whether or not the cross-had actually completely disappeared. If the same person watching the reaction was working the timer, errors could occur in their co-ordination. Using a burette to measure. This would remove the measuring errors associated with measuring cylinders, as they are correct to 0.1 cm where measuring cylinders are only 0.4. Burettes are a far more accurate way of measuring the correct amounts. Use light sensors to detect when the cross is no longer visible. The experiment could be connected to a light sensor, and to a timer. These light sensors will detect when there is no light shining through the substance. This would automatically stop the timer and therefore make the experiment fairer and more accurate. Doing each solution on separate occasions and repeating them more than three times giving me a better average could have extended my investigation. But these choices were out of my control. Altogether I am quite pleased with my investigation and my results. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Patterns of Behaviour section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Patterns of Behaviour essays

  1. The aim of this coursework is to investigate the rate of reaction between sodium ...

    I justified my prediction and gained the results expected. This is a summary of the results gained: * When the concentration of sodium thiosulphate was low (i.e. 0.025M, 0.050M), the rate of reaction was low. * When the concentration of sodium thiosulphate was high (i.e.

  2. Experiment to Investigate the Rate of Reaction between Hydrochloric Acid and Sodium Thiosulphate, with ...

    Remove the thermometer and thoroughly wash and rinse out the conical flask and place it back on the large X on the safety mat. 14. Measure 10cm� of hydrochloric acid in the 10cm� measuring cylinder again and this time measure 40cm� of sodium thiosulphate in the 50cm� measuring cylinder.

  1. The aim of my experiment is to see how temperature affects the reaction rate ...

    This means that in a graph the line of best fit would have a curve. Considering the procedure- When considering the procedure I will take into account my scientific knowledge. I know that a reaction will occur and I know that I will have to record this reaction's rate.

  2. The aim is to see how the concentration of sodiumthiosulphate (Na2 S2 03) affects ...

    This also applies in reactions between two gasses when increasing the pressure has the same effect as increasing the concentration. Amount of the Reactants - It is important to keep the amount of reactants constant in the experiment because, as the reactant is used up, so the reaction slows down.

  1. The aim of this investigation is to see how the concentration of sodium thiosulphate ...

    A catalyst is usually a transition metal, a transition metal oxide (see uses of transition metals) or an enzyme in living cells. An exception is aluminium oxide, used in the Cracking of Hydrocarbons. How does a Catalyst work? A catalyst works by providing a convenient surface for the reaction to occur.

  2. To investigate a factor that affects the rate of reaction and why?

    Heat transfers kinetic energy to the chemical's particles. The more kinetic energy there is, the faster the particles move. Lower Temperature Higher Temperature This means a higher number of collisions each second. Also, because the energy is increased, more collisions are effective. Increasing the temperature between marble chips and hydrochloric acid will mean carbon dioxide is produced at a faster rate.

  1. The rate of reactions and what affects them - hydrochloric acid and sodium thiosulphate.

    These measurable properties are gas volumes, concentration of reaction mixture, and electrical conductivity. In the case of the investigation I am going to look at I am using the chemicals hydrochloric acid and sodium thiosulphate which when put together is a precipitation reaction.

  2. To investigate what affects the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid.

    I predict that when the temperature increases then the rate of reaction will also increase. I think this because, when the temperature increases, the particles of the liquid would move faster and cause more collisions. So, when the temperature increases, there is more kinetic energy, so there are more collisions

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work